To recreate the project, you might find the following source code useful.
In this example, there will be two devices, one is listening for other devices, the second one will be sending signals. This is not how it is going to work when as a final product, but our prototypes work this way, we simply did not have time to write the code in the way we wanted.

To make the code work, you need to include the following file in the folder arduino0017\libraries\hardware\[fatwareserial]:Download